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I see that my Powerwall firmware is now 1.50.0. As usual, Tesla haven't yet updated the change log. It's not long since 1.49 was applied so I'm surprised to see that I'm the first to report this update.
My Tesla app updated the software version info a few days ago and the actual firmware updated from 1.49.0 to 1.50.1 overnight last night.
I have two Powerwalls. From the very small sample I've seen so far, it suggests (just suggests) that 1.50.0 might be for single Powerwall 2 configs and 1.50.1 may be for 2 it more. That is a theory only.